Merge branch '1618-index-status-uses-delete-all' into 'master'

Use delete_all in the gitlab:elastic:clear_index_status rake task

See merge request !1143

lib/tasks/gitlab/elastic.rake

@@ -100,7 +100,7 @@ namespace :gitlab do
 
     desc "GitLab | Elasticsearch | Clear indexing status"
     task clear_index_status: :environment do
-      IndexStatus.destroy_all
+      IndexStatus.delete_all
       puts "Index status has been reset".color(:green)
     end